Why are the devs afraid of the sniper?

I don’t understand why they have so many guns that are basically instant kills if you hit the headshots anyway, and even if you don't for that matter, yet they won't give the sniper the realistic ttk one shot headshot on everybody. If I can get lasered at full health from 50+ feet with an smg, why can't I hit a one shot headshot? Why does it feel like the sniper is the only gun that is forgotten about every season. They won't even give us good skins for it, while every other weapon gets cool stuff. I hate it here.

You can't even move away from a heavy with a javelin, you're dead if they swing before you're already out of range. Smg point blank, you're dead. Shotguns point blank you're dead (with one shots most of the time anyway), it makes no sense. Just make the sniper a one shot headshot. If I can get killed in less than a half second by multiple guns, there is no reason whatsoever that a sniper isn't a one shot.

No one shot headshot? Okay, fine, give me a shorter bolt time, or give me bullet damage drop off. But there is no reason for an smg to kill me from more than 50 feet away before I can even get a follow up shot off.